I have some code which relies heavily on the fact that I can localize variables in recursive functions. However, sometimes I need to examine the top of the local stack:

#!/usr/bin/perl -l

use strict;
use warnings;

our $x = 3;

foo(7);

sub foo {
    local $x = shift;
    print $x;
    # is there any way to get the "3" value?
}
[download]

The obvious solution is for me to cache the top-level values of the variables in question and that's probably what I will do, but I was wondering if there is any way to examine the stack created by local? I'd prefer to do this without C, but if I must ...

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